Seattle Hempfest

Seattle Hempfest was an annual event in the city of Seattle, Washington, United States, (and the world's largest annual gathering) advocating the legalization of cannabis. It was held every summer for 19 years, from 1991 to 2020, after which permission for vendors to use an access road was revoked and the logistical problems of getting vendors into and out of the park became an insurmountable obstacle. As of 2025, it's future appears uncertain.

Vivian McPeak serves as the organization's executive director. Founded in 1991 as the Washington Hemp Expo, a self-described "humble gathering of stoners" attended by only 500 people, and renamed the following year as Hempfest, it grew into a three-day annual political rally, concert, and arts and crafts fair with attendance typically over 100,000. Speakers included Seattle city council member Nick Licata, actor/activist Woody Harrelson (2004), travel writer and TV host Rick Steves (2007), (2010), 2012 Green Party speaker Jill Stein, Dallas Cowboys center Mark Stepnoski (2003), and former chief of the Seattle Police Department Norm Stamper (2006). Hempfest also in recent years attracted such well-known performers as Fishbone (2002), The Kottonmouth Kings (2004), Rehab (2006), and Pato Banton (2007) to its five stages spread throughout Myrtle Edwards Park and Elliott Bay Park, on Seattle's waterfront.